The GATE Grind

GATE 2022 AG – Question 49

Farm Power · Tractors and Power Tillers · 2 marks · Numerical answer

Tractor vibration has RMS acceleration3.15 m/s² and frequency80 Hz. Find RMS displacement amplitude in µm, to two decimals. Use π=3.14.

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Correct answer: 12.20 to 12.80

Explanation

For sinusoidal motion, acceleration magnitude is ω² times displacement magnitude, including their RMS values. Thus $x_{rms}=3.15/(2(3.14)(80))^2=12.4799\times10^{-6}$ m. The answer is **12.48 µm**; no additional √2 conversion is needed.

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